CN102725489A - Canister aftertreatment module - Google Patents

Canister aftertreatment module Download PDF

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Publication number
CN102725489A
CN102725489A CN2010800622739A CN201080062273A CN102725489A CN 102725489 A CN102725489 A CN 102725489A CN 2010800622739 A CN2010800622739 A CN 2010800622739A CN 201080062273 A CN201080062273 A CN 201080062273A CN 102725489 A CN102725489 A CN 102725489A
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CN
China
Prior art keywords
processing module
treatment device
jar
catalyst converter
post
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2010800622739A
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Chinese (zh)
Inventor
R·G·希尔弗
C·P·希特尔
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Caterpillar Inc
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Caterpillar Inc
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Filing date
Publication date
Application filed by Caterpillar Inc filed Critical Caterpillar Inc
Publication of CN102725489A publication Critical patent/CN102725489A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/2073—Selective catalytic reduction [SCR] with means for generating a reducing substance from the exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • F01N3/106—Auxiliary oxidation catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/02—Two or more expansion chambers in series connected by means of tubes
    • F01N2490/06—Two or more expansion chambers in series connected by means of tubes the gases flowing longitudinally from inlet to outlet in opposite directions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea

Abstract

An aftertreatment module (10) for use with an engine is disclosed. The aftertreatment module may have a canister (12), and a wall (18) disposed within the canister and axially-dividing the canister into a first portion (20) and a second portion (22). The aftertreatment module may also have a first treatment device (28) disposed within the first portion, an inlet (14) connected to the first portion, a second treatment device (30) disposed within the second portion, an outlet (16) connected to the second portion, and an external tube (24) extending from the first portion to the second portion.

Description

The pot type post-processing module
Technical field
The present invention relates to a kind of post-processing module, relate more particularly to a kind of pot type post-processing module.
Background technique
The complex mixture of engine exhaust air pollutant that comprises motor and other motors known in the art of DENG, petrol engine, gaseous fuel power.These air pollutant are made up of gaseous compound, and these gaseous compounds especially comprise nitrogen oxide (NO X).Because the raising of environmental consciousness, exhaust emission standard are more and more stricter, can be according to the type of the size of the model of motor, motor and/or motor to by the NO of engine emission in the atmosphere XAmount stipulate.
In order to satisfy NO XRules, some manufacturers of engines have realized a kind of strategy that is called as SCR (SCR).SCR is reducing agent (modal the urea ((NH of being 2) 2CO) or water/urea liquid) optionally be ejected in the exhaust flow of motor and be attracted to the process on the carrier in downstream.The urea liquid that is sprayed decomposes ammonification (NH 3), the NO in ammonia and the waste gas XReaction forms water (H 2O) and diatomic nitrogen (N 2).
The carrier that in some applications, possibly be used for the SCR purpose is very greatly to help guaranteeing that it has enough surface areas or effective volume adsorbs for effective reductive NO XThe ammonia of required appropriate amount.These large-scale carriers are very expensive and in vent systems, need sizable space.In addition, carrier must be disposed in eject position place enough far away, downstream so that ammonia solution is decomposed into ammonia if having time and is evenly distributed in the exhaust flow with reductive NO effectively XThis spatial arrangement can further increase the encapsulation difficulty of vent systems.
MakotoThe Japan Patent open file No.2008/274 that publishes on November 13rd, 2008,851 (' 851 open files) in the system of a kind of exemplary outfit SCR that uses with internal-combustion engine is disclosed.This system comprises off-gas cleaning equipment, the mixing tube that this off-gas cleaning equipment has air accumulation jar, an independent dispersion tank and between the edge of air accumulation jar and gas dispersion tank, connects.Particulate filter and oxidation catalyzer are disposed in the air accumulation jar, and SCR catalyst converter and ammonia reduction catalyst converter then are disposed in the gas dispersion jar.The ammonia sparger is arranged in mixing tube, at the upper reaches of SCR catalyst converter.
Though compact dimensionally, ' 851 patent possibly still have problems.Especially a plurality of jars that use in ' 851 system that exists possibly increase the overall dimensions of component costs, encapsulation complexity and system.In addition, single SCR catalyst converter possibly also make system cost rise very greatly thus.
The disclosed post-processing module of the present invention has solved described one or more problems and/or other problems of the prior art in the above.
Summary of the invention
One aspect of the present invention discloses a kind of post-processing module.This post-processing module can comprise jar and be disposed in wall in the jar and that vertically jar is divided into first portion and second portion.This post-processing module can also have first treatment device, the inlet that is connected with first portion that are arranged in the first portion, is arranged in second treatment device in the second portion, the outlet that is connected with second portion and the pipe that extends to the outside of second portion from first portion.
Second aspect of the present invention discloses another kind of post-processing module.Second treatment device that this post-processing module can comprise jar, partly locate to be arranged in first treatment device of jar and partly locate to be arranged in jar in the opposite second end of jar at the first end of jar.This post-processing module can also comprise and being physically located between first and second treatment device and at the inlet at both upper reaches of first and second treatment device, and is physically located between first and second treatment device and in the outlet in the downstream of first and second treatment device.
The third aspect of the invention discloses another post-processing module.This post-processing module can comprise jar, and this jar has at the inlet at first end place with in the outlet at opposed the second end place.This post-processing module can also comprise outside pipe, and it is connected with inlet and has a serpentine shape that total length of flow is many times of the length of flow of jar.The pipe of this outside can be contained within the axial length dimension of jar.This post-processing module can also comprise first treatment device that is arranged in the outside pipe and second treatment device that is arranged in the jar.
Description of drawings
Fig. 1 shows exemplary disclosed post-processing module with transverse sectional view,
Fig. 2 shows the post-processing module of Fig. 1 with right elevation,
Fig. 3 shows the post-processing module of Fig. 1 with end elevation, and
Fig. 4 has illustrated another post-processing module with stereogram.
Embodiment
Exemplary post-processing module 10 has been shown in Fig. 1 to Fig. 3.Post-processing module 10 can comprise single jar 12, and this jar processed by the material with anti-corrosion property, for example stainless steel.In the embodiment shown in Fig. 1 to Fig. 3, jar 12 comprises single inlet 14 and single outlet 16.Yet what can estimate is that post-processing module 10 can comprise desirable any amount of entrance and exit.Post-processing module 10 can also comprise inwall 18, and it is divided into first portion 20 and second portion 22 with jar 12 vertically, and this first portion seals with respect to second portion hermetically.Wall 18 can tilt with respect to the longitudinal axis of jar 12, thereby makes flow region and the flow region at outlet 16 places at inlet 14 places diminish with the distance of inlet 14 with outlet 16 separately.
Outside pipe 24 can be communicated with first portion 20 with second portion 22 fluids.In one embodiment, outside pipe 24 can with jar 12 parallel to an axiss, and be connected to jars 12 cylindrical sides at relative two ends through flexible connection part 26.This flexible connection part 26 can be can crooked approximately an angle of 90 degrees and on jar 12, have elliptical openings and have the cobra head dummy coupling of circular open at pipe 24 places.If need, also can use the coupling of other types.
Post-processing module 10 can also have one or more treatment device of the first end that is positioned at first portion 20, and the one or more treatment device that are positioned at second opposite end of second portion 22.For example, oxidation catalyzer 28 can be arranged in the first portion 20, and combined type diesel particulate filter cleaner/SCR (CDS) catalyst converter 30 can be arranged in the second portion 22.In one embodiment, can also be at the additional catalyst converter 32 of the arranged downstream of CDS catalyst converter 30 in second portion 22.The downstream area 32B that catalyst converter 32 can comprise the upstream region 32A of SCR catalyst converter effect and play cleaning catalyst converter (like the ammonia reduction catalyst converter) effect.In a kind of alternative embodiment, catalyst converter 32 can be special cleaning catalyst converter (for example, catalyst converter 32 can not possess SCR functional).What can expect is that though in jar 12, need additional space, CDS catalyst converter 30 can alternatively independent and special particle filter and the replacement of SCR catalyst converter by one when needed.Opposite end at jar 12 can leave space 34; This space is arranged in the axial outside of all treatment device that are arranged in jar, with as be of value to waste gas lead to and from the surface of the handled device of the coupling 26 of the pipe 24 of outside on the abundant manifold of mean allocation.
In the described in the above structure, the inlet 14 and export 16 boths can be between the treatment device that is physically located in first portion 20 and second portion 22.Inlet 14 can be positioned at the upper reaches of all treatment device.Outlet 16 can be positioned at the downstream of all treatment device.Inlet 14 can extend along roughly opposite with the bearing of trend of outlet 16 direction from jar 12.
Oxidation catalyzer 28 can be a diesel oil oxidation catalyst converter (DOC) for example.As DOC; Oxidation catalyzer 28 can comprise porous ceramic honeycomb shape structure, wire netting, metal or ceramic foam; Perhaps other scribble or otherwise contain the suitable carrier of catalysis material (for example precious metal), and this catalytic material catalyzes chemical reaction changes the component via the waste gas of oxidation catalyzer 28.In one embodiment, oxidation catalyzer 28 can include to be beneficial to NO is converted into NO 2Palladium, platinum, vanadium or their mixture.In another embodiment; Oxidation catalyzer 28 can be alternatively or is additionally carried out the particle capture function and (that is to say; Oxidation catalyzer 28 can be the catalytic particulate catcher; For example CRT or CCRT), reduce hydrocarbon function, reduce the function of carbon monoxide and/or other functions known in the art.
As described above, CDS catalyst converter 30 can be configured to carry out the particle capture function.Especially, CDS catalyst converter 30 can comprise the filtering medium that is configured to from exhaust flow, remove particulate matter.In one embodiment, the filtering medium of CDS catalyst converter 30 can be to be generally columniform buried type (deep-bed type) filtering medium, and it is configured to essentially homogenous mode accumulated particulate matter on its whole thickness.The filtering medium can comprise the low density material that has flow admission side and flow exit side and processed by metal granule or ceramic particle through sintering process.What can expect is, the filtering medium can alternatively be a surface-type filtering medium, and it is processed by ceramic foam, wire netting or arbitrary materials that other are fit to.
CDS catalyst converter 30 can also be configured to carry out the SCR function.Particularly, the filtering medium of CDS catalyst converter 30 can be by stupalith titanium oxide for example; Base metal oxide is like vanadium and tungsten; Zeolite; And/or noble metal is processed or otherwise coating above-mentioned material is arranged.Through this synthetic, the reducing agent of the decomposition of in the exhaust flow through CDS catalyst converter 30, following can be adsorbed on the surface of filtering medium and/or in the filtering medium, there reducing agent can with NOx (NO and the NO in the waste gas 2) react to form water (H 2O) and diatomic nitrogen (N 2).What can expect is that CDS catalyst converter 30 can be carried out particle capture function and SCR function simultaneously or alternatively carry out particle capture function and SCR function with the mode of serial when needed on the whole medium of CDS catalyst converter 30.
As described above, catalyst converter 32 can comprise upstream region 32A and downstream area 32B.Especially; Single carrier block of catalyst converter 32 can comprise the zone (32A) that is located substantially on the upper reaches; This zone and CDS catalyst converter 30 are similar; By following material process or otherwise coating this material is arranged, the absorbing and reducing agent or reducing agent is included from the teeth outwards of this material with other mode, with through NOx (NO and NO in its waste gas 2) reaction, form water (H 2O) and diatomic nitrogen (N 2).Simultaneously, the carrier block of catalyst converter 32 can also comprise the zone (32B) that is located substantially on downstream, and this zone-coated has or otherwise contains the different catalyst with reducing agent oxidation residual in the waste gas.
Reducing agent injector 36 can be disposed in pipe 24 upstream or near the upstream of pipe 24 (for example, in the upstream of pipe 24, in coupling 26 or in gap 34) and be configured to injection of reducing agent is mapped in the waste gas of flowing pipe 24.Gaseous state or liquid reducing agent are generally the salt of water/urea liquid, ammonia, liquefaction anhydrous ammonia, ammonium carbonate, ammino-complex, or hydrocarbon (like diesel oil), can be reduced agent injector 36 and spray or otherwise be advanced in the waste gas of flowing pipe 24.Reducing agent injector 36 can be disposed in a distance that is positioned at CDS catalyst converter 30 upper reaches, before getting into CDS catalyst converter 30, has time enough to mix with waste gas and can decompose fully with the reducing agent that allow to spray.The even distribution of reducing agent in the waste gas of CDS catalyst converter 30 of flowing through of like this, fully decomposing can strengthen NO in the waste gas XReduction.Can be in the distance between reducing agent injector 36 and the CDS catalyst converter 30 (that is the length of pipe 24) based on exhaust flow through post-processing module 10 and/or the flow rate on the transverse cross-sectional area of pipe 24.In the example of in Fig. 1 to Fig. 3, being painted, pipe 24 can extend the major part of the length of jar 12.
In order to strengthen combining of reducing agent and waste gas, in pipe 24, can be provided with mixer 38.In one embodiment, mixer 38 can comprise that the wing or blade are to cross the vortex motion that pipe produced waste gas at 24 o'clock at exhaust flow.In another embodiment, mixer 38 can comprise from managing 24 inwall and radially extend the ring of a segment distance towards interior longitudinal axis to pipe 24 that the waste gas that this ring is configured to strengthen in pipe 24 is turbulent.In another embodiment, mixer 38 can be positioned at the upper reaches or downstream (shown in Fig. 1 to Fig. 3) of reducing agent injector 36.
The parameter that one or more probers are used to monitor post-processing module 10 can be set.For example; The space 34 that first prober 40 can be arranged in second portion 22 (for example; Center with respect to jar 12 is outside vertically from CDS catalyst converter 30); And second prober 42 can be positioned at second portion 22 inner outlets 16 places (for example, vertically between oxidation catalyzer 28 and catalyst converter 30 and 32).In one embodiment, first prober 40 can be a hygrosensor, and it is configured to produce first signal of the temperature of indicating the waste gas that gets into CDS catalyst converter 30.This first signal can especially be used to confirm the operating temperature and expectation efficient of CDS catalyst converter 30.Second prober 42 can be used to detect the composition of the waste gas that leaves catalyst converter 32, for example NO XConcentration or remaining reducing agent.Second prober 42 can produce the secondary signal of this composition of indication, and secondary signal especially is used to confirm the practical efficiency of CDS catalyst converter 30 and/or catalyst converter 32.What can expect is that when needed, first and/or second prober 40,42 can be configured to detect other parameters, and is used to other purposes.
What can expect is that in some cases, the treatment device that can contact post-processing module 10 can be helpful.Therefore, in one embodiment, surrounding end sections space 34, jar 12 can be connected with the intermediate portion of removable mode with the jar 12 that oxidation catalyzer 28, CDS 30 and catalyst converter 32 are housed at each opposite end place of post-processing module 10.For example, if need, end sections can be threaded with intermediate portion or breech lock is connected.Through this structure, end sections can optionally be removed with inspection and/or change each catalyst converter.
Fig. 4 shows an alternative embodiment of post-processing module 10 '.Similar with the embodiment of Fig. 1 to Fig. 3, the post-processing module 10 ' of Fig. 4 can comprise jar 12 ', opposed end space 34 ' and second portion 22 ' that this jar has inlet 14 ' and outlet 16 ' and surrounds.Yet different with the embodiment of Fig. 1 to Fig. 3 is that the post-processing module 10 ' of Fig. 4 can not comprise first portion 20.That is to say that in the embodiment of Fig. 4, oxidation catalyzer 28 ' can be disposed in the pipe 24 ' with reducing agent injector 36 ', rather than in jar 12 '.In addition, pipe 24 ' can have the shape of wriggling generally and repeatedly change flow direction.In this structure, pipe 24 ' can have the length of flow for three times of the length of flow of jar 12 ', and still can be accommodated in jar 12 ' the axial length (that is, pipe 24 ' can not extend beyond jar 12 ' end in the axial direction).
Industrial applicibility
Post-processing module of the present invention can be used to need to purify the vent systems of any engine construction of composition, and component packages is unusual important problem in this motor.Disclosed post-processing module can be improved encapsulation with receiving means through using single jar, and through using outside pipe can also provide sufficient reducing agent to mix and decomposing.Now the exhaust flow via post-processing module is described.
Referring to Fig. 1, exhaust flow contains the complex mixture of air pollutant, and it especially comprises nitrogen oxide (NO X), exhaust flow can be directed into the post-processing module 10 via inlet 14 from the motor (not shown).Waste gas can 14 flow into the post-processing module 10 from entering the mouth, and flows to wall 18, and exhaust flow turns to through the inclination of wall 18 at the wall place, passes oxidation catalyzer 28.The angle of wall 18 can promote waste gas roughly distributing uniformly on the face of oxidation catalyzer 28 with the corresponding progressively restriction of the exhaust flow that is used to arrive.When waste gas process oxidation catalyzer 28, some NO in the waste gas can be converted into NO 2
Through behind the oxidation catalyzer 28, waste gas can flow in the space 34 in the first portion 20 of jar 12, flowing pipe 24, and flow in the space 34 in jars 12 the second portion 22.At this moment, can injection of reducing agent be mapped in the exhaust flow, make the eddy current and/or the turbulent flow of the waste gas that strengthens through mixer 38 can be used in exhaust flow, carry secretly and distribute reducing agent at the upper reaches of mixer 38.At the eddy current of waste gas and reducing agent and/or turbulent flow along the length of pipe 24 through out-of-date, this mixture can continue to homogenize and reducing agent can begin to decompose.When mixture arrived CDS catalyst converter 30, most reducing agent should decompose, to be used for the NO in CDS catalyst converter 30 and catalyst converter 32 XThe reduction purpose.
When waste gas process CDS catalyst converter 30, particulate matter can be removed from waste gas, and NO XCan be reduced into water and diatomic nitrogen with the reducing agent reaction.Waste gas can leave CDS catalyst converter 30 subsequently and get in the catalyst converter 32, in catalyst converter 32, NO can take place XFurther reduction, and remaining reducing agent can be absorbed.After in catalyst converter 32, handling, waste gas can be guided to be discharged in the atmosphere (or the exhaust system component in other downstream) via outlet 16 by wall 18 once more.
Referring to Fig. 4, exhaust flow contains the complex mixture of air pollutant, and it especially comprises nitrogen oxide (NO X), exhaust flow can be directed into the post-processing module 10 ' via the inlet 14 ' of pipe 24 ' and through oxidation catalyzer 28 ' from the motor (not shown).When waste gas during through oxidation catalyzer 28 ', some NO in the waste gas can be converted into NO 2At this moment, can injection of reducing agent be mapped in the exhaust flow, make the eddy current and/or the turbulent flow of the waste gas through mixer 38 ' enhancing can be used in exhaust flow, carry secretly and distribute reducing agent at the upper reaches of mixer 38 '.At the eddy current of waste gas and reducing agent and/or turbulent flow along the length of pipe 24 ' through out-of-date, this mixture can continue to homogenize and reducing agent can begin to decompose.When mixture arrived the CDS catalyst converter 30 ' second portion 22 ' in, most reducing agent should decompose, to be used for the NO in CDS catalyst converter 30 ' and catalyst converter 32 ' XThe reduction purpose.
When waste gas during through CDS catalyst converter 30 ', particulate matter can be removed from waste gas, and NO XCan be reduced into water and diatomic nitrogen with the reducing agent reaction.Waste gas can leave CDS catalyst converter 30 ' subsequently and get in the catalyst converter 32 ', in catalyst converter 32 ', NO can take place XFurther reduction, and remaining reducing agent can be absorbed.After in catalyst converter 32 ', handling, waste gas can be guided to be discharged in the atmosphere (or the exhaust system component in other downstream) via outlet 16 ' once more.
Post-processing module 10 and 10 ' can promote uniform waste gas to distribute and reducing agent decomposition fully.Especially; Inlet 14,14 ' and the position that exports 16,16 '; Combining with the inclination of wall 18 to promote the even distribution through the treatment device in jar 12 and 12 ', can promote the reducing agent decomposition and manage 24,24 ' position and length with mixer 38,38 '.Space 34,34 ' also can promote to distribute and the reducing agent decomposition with coupling 26,26 ' structure.
Post-processing module 10 and 10 ' can be simple, compact and relatively low cost.Post-processing module 10,10 ' can be simple and compact because they can only use one single jar with the catalyst converter of multiple function is provided.For example, CDS catalyst converter 30,30 ' can provide particle capture and NO simultaneously XThe function of reduction, and catalyst converter 32,32 ' can provide NO XThe function that reduction and reducing agent absorb.Post-processing module 10 and 10 ' simplicity can realize the low-cost solution of exhaust after-treatment.
It will be apparent to one skilled in the art that and under the situation that does not break away from the scope of the present disclosure, to make various changes and modification post-processing module of the present invention.To those skilled in the art, under the situation of the mode of execution of this disclosed specification and post-processing module, other embodiments also are conspicuous in consideration.Specification all should be understood that it only is exemplary with each example, and real protection scope of the present disclosure is pointed out by following claim and their equivalent.

Claims (10)

1. a post-processing module (10) comprising:
Jar (12);
Wall (18), it is disposed in said jar and vertically said jar is divided into first portion (20) and second portion (22);
First treatment device (28), it is arranged in the said first portion;
Inlet (14), it is connected with said first portion;
Second treatment device (30), it is arranged in the said second portion;
Outlet (16), it is connected with said second portion; And
Outside pipe (24), it extends to said second portion from said first portion.
2. according to the described post-processing module of claim 1, wherein, the longitudinal axis of said wall with respect to said jar tilts, and the distance that makes the flow region of ingress become and enter the mouth is littler, and the flow region in outlet port becomes and the distance that exports is littler.
3. according to the described post-processing module of claim 4, wherein, said inlet is outstanding from jar along opposite with outlet basically direction.
4. according to the described post-processing module of claim 1, wherein, said first treatment device is an oxidation catalyzer, and said second treatment device is the particle filter and the SCR catalyst converter of combination.
5. according to the described post-processing module of claim 4, also comprise the cleaning catalyst converter (32) that is positioned at the said second treatment device downstream.
6. according to the described post-processing module of claim 5, also comprise the additional SCR catalyst converter (32A) that is positioned at the said second treatment device downstream and integrates with said cleaning catalyst converter.
7. according to the described post-processing module of claim 1, also comprise the reducing agent injector (36) at the upper reaches of the pipe that is positioned at said outside.
8. according to the described post-processing module of claim 1, wherein, the pipe of said outside is connected to a side of said jar, and is accommodated within the length of said jar.
9. according to the described post-processing module of claim 1, wherein, said inlet and said outlet are vertically between said first treatment device and said second treatment device.
10. according to the described post-processing module of claim 1, also comprise at least one in the following array apparatus:
Hygrosensor (40), it is axially outer from said second treatment device with respect to said entrance and exit; And
Component sensor (42), it is presented axially between said first treatment device and second treatment device, and is positioned at the downstream of said first treatment device and second treatment device.
CN2010800622739A 2009-12-22 2010-10-28 Canister aftertreatment module Pending CN102725489A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US12/644,936 US8460610B2 (en) 2009-12-22 2009-12-22 Canister aftertreatment module
US12/644,936 2009-12-22
PCT/US2010/054372 WO2011087549A2 (en) 2009-12-22 2010-10-28 Canister aftertreatment module

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Publication Number Publication Date
CN102725489A true CN102725489A (en) 2012-10-10

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US (1) US8460610B2 (en)
CN (1) CN102725489A (en)
DE (1) DE112010004966T5 (en)
WO (1) WO2011087549A2 (en)

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